<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
	.a001{
		height:200px;
		width:700px;
		background-color:#3FF;
		margin-bottom:10px;
	}
	.a002{
		height:200px;
		width:200px;
		background-color:#6F9;
		float:left;
		margin-right:10px;
		margin-bottom:10px;
	}
	.a003{
		height:200px;
		width:200px;
		background-color:#F00;
		float:left;
		margin-bottom:10px;
		margin-right:10px;
	}

	.a004{
		height:200px;
		width:280px;
		background-color:#333;
		float:left;

	}
		.a005{
		height:200px;
		width:700px;
		clear:both;
		background-color:#00F;
	}
	.father{
		height:620px;
		width:700px;
		margin:0 auto;
	}



</style>
</head>

<body>
<div class="father">
<div class="a001"></div>
<div class="a002"></div>
<div class="a003"></div>
<div class="a004"></div>
<div class="a005"></div>
</div>
</body>
</html>
